cookbooks/fb_apache/templates/default/apache_modules.erb

<%
    node['fb_apache']['modules'].each do |mod|
      sofile = node['fb_apache']['modules_mapping'][mod]
      sofile = mod unless sofile
      mod = "#{mod}_module"
      so = ::File.join(node['fb_apache']['modules_directory'], sofile)
%>
LoadModule <%= mod %> <%= so %>
<%  end %>